Improve neat mug arrangement (7)
I believe the answer is:
augment
'improve' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps they are linked in a way I don't understand?
'neat mug arrangement' is the wordplay.
'arrangement' indicates an anagram.
'neat'+'mug'='neatmug'
'neatmug' with letters rearranged gives 'AUGMENT'.
Can you help me to learn more?
(Other definitions for augment that I've seen before include "Increase number of" , "Grow - intensify" , "Swell" , "boost" , "Add to, increase" .)